BS EN 771-1-2003 pdf download.Specification for masonry unlts Part 1 : Clay masonry units.
This BS EN 771-1 specifies the characteristics and performance requirements for masonry units manufactured from day for use in masonry construction (e.g. facing and rendered masonry, loadbeaflng or non-loadbearing masonry structures, including internal linings and partitions. for building and civil engineering).
This European Standard is intended to apply to two groups of fired-clay masonry units:
LD units (see 3.4 and 5.2) compnsing:
clay masonry units with a gross dry density of less than or equal to 1000 kg/rn3 for use in protected masonry.
HO units (see 3.5 and 5.3) comprising:
a) all clay masonry units for use in unprotected masonry:
b) clay masonry units with a gross dry density of greater than 1000 kg/rn3 for use in protected masonry.
This European Standard includes those day masonry units of an overall non-rectangular parallelepiped shape.
It defines the performance related to e.g. dimensional tolerances, strength, density measured according to the corresponding test methods contained in separate European Standards.
It provides for the evaluation of conformity of the product to this European Standard.
The marking requirement for products covered by this European Standard is included.
E) This document does not specify standard sizes for clay masonry units, nor does it specify standard work dimensions, angles and radii of specially shaped day masonry units. This document does not indude method of measurement, tolerance and range requirements for dimensions, angles and radii characteristics of specially shaped day masonry units. (!i
This European Standard does not cover requirements for the following: units for paving, flue liners and storey height day units and day masonry units with an incorporated thermal insulation material bonded to the faces of the unit susceptible to be exposed to fire. It does, however, indude clay units for external chimney masonry.
2 Normative references
This European Standard incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publica.
3.3
protected masonry
masonry which is protected against water penetration. It can either be masonry in external walls which is protected, (e.g. by a layer of suitable render or by cladding), or it can be the inner leaf of a cavity wall or it can be an internal wall. It may or may not be loadbearing
3.4
LD unit
clay masonry unit with a low gross dry density for use in protected masonry
3.5
HD unit
clay masonry unit for unprotected masonry as well as clay masonry unit with a high gross dry density for use in protected masonry
3.6
co-ordinating size
size of the co-ordinating space allocated to a masonry unit including allowances for joints and tolerances
3.7
work size
size of a masonry unit specified for its manufacture, to which the actual size conforms within permissible deviations
3.8
actual size
size of a masonry unit as measured
3.9
regular shaped masonry unit
masonry unit with an overall rectangular parailelepiped shape
3.10
specially shaped masonry unit
masonry unit which is not a rectangular parallelepiped
3.11
accessory unit
masonry unit Which is shaped to provide a particular function. e.g. to compiete the geometry of the masonry
3.12
interlocking features
shaped matched projections and indentations on masonry units, e.g. tongue and groove systems
3.17
recess
depression or indentation in one or more surfaces of a masonry unit (e.g. mortar pocket, rendering keyway, gnphole)
3.18
grip hole
a formed void that passes completely through a masonry unit perpendicular to the bed face for the
purpose of handling the masonry unit
3.19
shell
peripheral material between a perforation and the surface of a masonry unit
3.20
web
solid material between the perfoations in a masonry unit
3.21
declared value
value that a manufacturer is confident in achieving, bearing in mind the precision of test and the variability of the manufacturing process
3.22
mean compressive strength of masonry units
arithmetic mean of the compressive strengths of masonry units
3.23
normalised compressive strength
compressive strength of masonry units converted to the air dry compressive strength of an equivalent
100 mm wide x 100 mm high masonry unit
NOTE See the procedure given in Annex A of EN 772-1: 2000
3.24
damp proof course unit
clay masonry unit which when laid In two courses with broken bond in a strong cernentitious mortar, will resist rising damp in masonry
3.25
high precision clay masonry unit
clay masonry unit with small dimensional tolerance especially in unit height
3.26
vertically perforated or hollow clay masonry unit.BS EN 771-1-2003 pdf download.

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